I get an error in excel...data may have been lost..some is gone.
 

I have a spreadsheet with Pictures in one of the columns. Twice I have
gotten a message when I open Excel...Error data may have been lost...only
option is to click ok. When I open the spreadsheet all the pictures are
gone. I re-did them but it now happened again. Can anyone tell me if there
is a way to easily recover them AND to prevent it from happening again.
Thanks